On the constraints that duality imposes on the broken SU(6)sub(w) structure of the baryonic resonance photocouplings

The absence of exotics and the natural parity exchange dominance in the t-channel in high-energy meson photoproduction of nucleons impose, via duality, restrictions on the baryonic resonance photocouplings. In a broken SU(6)sub(w) parametrization these constraints allow different couplings for the W = 1/2 and W = 3/2 baryonic resonances and impose relations between the transitions to the 70 and 56 SU(6)sub(w) representations. It is shown that the low energy baryonic resonance photocouplings are in good agreement with these high energy constraints. (author)